import java.util.Scanner;
public class Example2_3{
    public static void main (String args[]){
       System.out.println("请输入若干个数，每输入一个数回车确认");
       System.out.println("最后输入数字0结束输入操作");
       Scanner reader=new Scanner(System.in);
       double sum=0;
       double x =reader.nextDouble();
       while(x!=0){
         sum=sum+x;
         x=reader.nextDouble();
          }
          System.out.println("sum="+sum);
         }
}


